After the final choice, either Liam or Charlie appear in a stutterproof suit. In Liam's case, it symbolizes how he's subsumed his morals to serve Monarch as a Striker, in order to protect his wife. In Charlie's case, this is the first time in the game he's not thinking about himself, and it makes sense that he's not wearing his personal protection anymore and has to lose his individuality.
From the Doylist perspective, there's not much point in creating two different character models, plus animation, for a single scene.
There are two types of people who can move in a Time Stutter: those who are wearing somewhat bulky Chronon harnesses, and those who are suffering from/ learnt to control their Chronon Sickness. This becomes foreshadowing of Martin Hatch's true nature as he is shown quite a few times to be moving during a Time Stutter without a harness even showing through his clothes.
Partway through the game, Paul has the option to choose whether he thinks either Hatch or Amaral is a traitor. The fact that you can choose Martin might seem strange, as up to this point Paul has obviously trusted him enough to let him run most of the company, but remember the previous junction. Paul foresaw that if he gave the speech at the Gala, it would go off without a hitch, but if Hatch gave it, the speech would be interrupted by what seems to be an assassin, who takes a few potshots at Hatch. Why would that happen in one timeline but not the other, when the higher priority target is all but openly presenting himself? It's not concrete, but it would definitely be a sign that something fishy's going on.
